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    <style type="text/css">
        * {
            margin: 0;
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        .wrap {
            width: 330px;
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            width: 100px;
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            color: #000;
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            text-align: center;
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        .wrap li ul {
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    </style>
    <script src="jquery-1.12.2.js"></script>
    <script>
        $(function () {
            //获取.wrap下面的ul中的li,注册鼠标进入和离开的事件
            $(".wrap>ul>li").mouseover(function () {
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            //.stop()方法用来停止动画
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</head>
<body>
<div class="wrap">
    <ul>
        <li>
            <a href="javascript:void(0);">帅哥系列</a>
            <ul>
                <li><a href="javascript:void(0);">乔峰</a></li>
                <li><a href="javascript:void(0);">张无忌</a></li>
                <li><a href="javascript:void(0);">郭靖</a></li>
            </ul>
        </li>
        <li>
            <a href="javascript:void(0);">美女系列</a>
            <ul>
                <li><a href="javascript:void(0);">柳 岩</a></li>
                <li><a href="javascript:void(0);">杨 幂</a></li>
                <li><a href="javascript:void(0);">萝 拉</a></li>
            </ul>
        </li>
        <li>
            <a href="javascript:void(0);">渣男妇腐女</a>
            <ul>
                <li><a href="javascript:void(0);">凤姐</a></li>
                <li><a href="javascript:void(0);">助教</a></li>
                <li><a href="javascript:void(0);">导师</a></li>
            </ul>
        </li>
    </ul>
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